The Ubuntu "Light Themes" Ambiance and Radiance have finally been ported to GTK3. The new version has just been uploaded to the Ubuntu 11.10 Oneiric Ocelot repositories and it uses a new GTK3 engine called "Unico" (available in the Universe repository), especially designed for the Ubuntu Light themes.

Here are some screenshots:

(The above screenshot was updated to include the new overlay scrollbars for GTK3, package which was just uploaded to the Oneiric repos)

For comparison, here's Adwaita GTK3 theme and Ambiance GTK3 using The Widget Factory:

(Adwaita GTK3 theme)

(Ambiance GTK3 theme)

Update (the download links were updated too): Radiance GTK3 theme is now also available. Here's a screenshot:

Important: this is the first release of Ambiance / Radiance GTK3 themes. There is still a lot of work to do until the final Ubuntu 11.10 Oneiric Ocelot release!

If you use Ubuntu 11.10 Oneiric Ocelot, you should get an update with the new Ambiance ported to GTK3 in a few minutes/hours (if you can't wait, download it from here).

For other Linux distributions, you can download Ambiance GTK2/3 from HERE - you'll also need Unico which you can get via bzr: